/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2021 Thomas Braun, Jens Klingen, Robin Krom
 *
 * For more information see: https://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Runtime.Serialization;
using Greenshot.Base.Interfaces.Drawing;
using Greenshot.Editor.Drawing.Fields;
using Greenshot.Editor.Helpers;

namespace Greenshot.Editor.Drawing
{
    /// <summary>
    /// Represents a rectangular shape on the Surface
    /// </summary>
    [Serializable]
    public class RectangleContainer : DrawableContainer
    {
        public RectangleContainer(Surface parent) : base(parent)
        {
            Init();
        }

        /// <summary>
        /// Do some logic to make sure all field are initiated correctly
        /// </summary>
        /// <param name="streamingContext">StreamingContext</param>
        protected override void OnDeserialized(StreamingContext streamingContext)
        {
            base.OnDeserialized(streamingContext);
            Init();
        }

        private void Init()
        {
            CreateDefaultAdorners();
        }

        protected override void InitializeFields()
        {
            AddField(GetType(), FieldType.LINE_THICKNESS, 2);
            AddField(GetType(), FieldType.LINE_COLOR, Color.Red);
            AddField(GetType(), FieldType.FILL_COLOR, Color.Transparent);
            AddField(GetType(), FieldType.SHADOW, true);
        }

        public override void Draw(Graphics graphics, RenderMode rm)
        {
            int lineThickness = GetFieldValueAsInt(FieldType.LINE_THICKNESS);
            Color lineColor = GetFieldValueAsColor(FieldType.LINE_COLOR, Color.Red);
            Color fillColor = GetFieldValueAsColor(FieldType.FILL_COLOR, Color.Transparent);
            bool shadow = GetFieldValueAsBool(FieldType.SHADOW);
            Rectangle rect = GuiRectangle.GetGuiRectangle(Left, Top, Width, Height);

            DrawRectangle(rect, graphics, rm, lineThickness, lineColor, fillColor, shadow);
        }

        /// <summary>
        /// This method can also be used from other containers, if the right values are passed!
        /// </summary>
        /// <param name="rect"></param>
        /// <param name="graphics"></param>
        /// <param name="rm"></param>
        /// <param name="lineThickness"></param>
        /// <param name="lineColor"></param>
        /// <param name="fillColor"></param>
        /// <param name="shadow"></param>
        public static void DrawRectangle(Rectangle rect, Graphics graphics, RenderMode rm, int lineThickness, Color lineColor, Color fillColor, bool shadow)
        {
            graphics.SmoothingMode = SmoothingMode.HighQuality;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.CompositingQuality = CompositingQuality.HighQuality;
            graphics.PixelOffsetMode = PixelOffsetMode.None;

            bool lineVisible = lineThickness > 0 && Colors.IsVisible(lineColor);
            if (shadow && (lineVisible || Colors.IsVisible(fillColor)))
            {
                //draw shadow first
                int basealpha = 100;
                int alpha = basealpha;
                int steps = 5;
                int currentStep = lineVisible ? 1 : 0;
                while (currentStep <= steps)
                {
                    using Pen shadowPen = new Pen(Color.FromArgb(alpha, 100, 100, 100))
                    {
                        Width = lineVisible ? lineThickness : 1
                    };
                    Rectangle shadowRect = GuiRectangle.GetGuiRectangle(
                        rect.Left + currentStep,
                        rect.Top + currentStep,
                        rect.Width,
                        rect.Height);
                    graphics.DrawRectangle(shadowPen, shadowRect);
                    currentStep++;
                    alpha -= basealpha / steps;
                }
            }


            if (Colors.IsVisible(fillColor))
            {
                using Brush brush = new SolidBrush(fillColor);
                graphics.FillRectangle(brush, rect);
            }

            graphics.SmoothingMode = SmoothingMode.HighSpeed;
            if (lineVisible)
            {
                using Pen pen = new Pen(lineColor, lineThickness);
                graphics.DrawRectangle(pen, rect);
            }
        }

        public override bool ClickableAt(int x, int y)
        {
            Rectangle rect = GuiRectangle.GetGuiRectangle(Left, Top, Width, Height);
            int lineThickness = GetFieldValueAsInt(FieldType.LINE_THICKNESS) + 10;
            Color fillColor = GetFieldValueAsColor(FieldType.FILL_COLOR);

            return RectangleClickableAt(rect, lineThickness, fillColor, x, y);
        }


        public static bool RectangleClickableAt(Rectangle rect, int lineThickness, Color fillColor, int x, int y)
        {
            // If we clicked inside the rectangle and it's visible we are clickable at.
            if (!Color.Transparent.Equals(fillColor))
            {
                if (rect.Contains(x, y))
                {
                    return true;
                }
            }

            // check the rest of the lines
            if (lineThickness > 0)
            {
                using Pen pen = new Pen(Color.White, lineThickness);
                using GraphicsPath path = new GraphicsPath();
                path.AddRectangle(rect);
                return path.IsOutlineVisible(x, y, pen);
            }

            return false;
        }
    }
}